Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1985-07-24
1988-03-08
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D16 32, D16 38, D14 11
Patent
active
D02945924
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Anderson David W.
Holtje Nelson C.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Smith James A.
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